It's the system used to identify shipping containers. 'SIB' is the owner's code (GE Simons of the Netherlands in this case), 'U' means it's a general freight container. The next six digits are the registration number (and should not be the same on multiple containers, but hey ho). This is followed by a check digit inside a box. '33B4' is the ISO size/type code for the container, the first '3' suggests it's 30' long but I can't decode the second '3' (height). 'B4' indicates a dry bulk pressurised container (up to 265kPa).

Mac - MOULagain KI#00004826 00004289In the interests of the environment, this post has been constructed entirely from recycled electrons.